Actually, the TA depends on the form of chlorine used. Stabilized chlorines (trichlor and dichlor) and bromine tabs are acidic and require a higher TA of about 120 -150 to keep the pH from 'crashing'.
Unstabilized chlorines (cal hypo, lithium, sodium hypo and bleach, and chlorine produced by a SWG are more pH neutral and maintain a more stable pH when the TA is much lower (80-100 ppm). Many pools that use these sources of chlorine actually benefit by lowering the TA even more to about 60 ppm! (Less outgassing of CO2 so less tendency for pH rise!)

CH of 350 is fine.

If she is using trichlor tabs then her TA is fine (but I would keep close tabs on her CYA levels!)